From: Ahmad Fatoum <a.fatoum@pengutronix.de>
To: Rob Herring <robh+dt@kernel.org>,
Maxime Coquelin <mcoquelin.stm32@gmail.com>,
Alexandre Torgue <alexandre.torgue@st.com>
Cc: kernel@pengutronix.de, Arnaud Pouliquen <arnaud.pouliquen@st.com>,
Ahmad Fatoum <a.fatoum@pengutronix.de>,
devicetree@vger.kernel.org,
linux-stm32@st-md-mailman.stormreply.com,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: [PATCH v2 2/2] ARM: dts: stm32: support child mfd cells for the stm32mp1 TAMP syscon
Date: Wed, 21 Oct 2020 12:28:56 +0200 [thread overview]
Message-ID: <20201021102855.18026-2-a.fatoum@pengutronix.de> (raw)
In-Reply-To: <20201021102855.18026-1-a.fatoum@pengutronix.de>
The stm32mp1 TAMP peripheral has 32 backup registers that survive
a warm reset. This makes them suitable for storing a reboot
mode, which the vendor's kernel tree is already doing[0].
The actual syscon-reboot-mode child node can be added by a board.dts or
fixed up by the bootloader. For the child node to be probed, the
compatible needs to include simple-mfd. The binding now specifies this,
so have the SoC dtsi adhere to it.
[0]: https://github.com/STMicroelectronics/linux/commit/2e9bfc29dd
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
v1 -> v2:
- Dropped simple-bus. simple-mfd is all that's needed
- reworded commit message
---
arch/arm/boot/dts/stm32mp151.dtsi | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm/boot/dts/stm32mp151.dtsi b/arch/arm/boot/dts/stm32mp151.dtsi
index 842ecffae73a..662c2408d41b 100644
--- a/arch/arm/boot/dts/stm32mp151.dtsi
+++ b/arch/arm/boot/dts/stm32mp151.dtsi
@@ -1542,7 +1542,7 @@ i2c6: i2c@5c009000 {
};
tamp: tamp@5c00a000 {
- compatible = "st,stm32-tamp", "syscon";
+ compatible = "st,stm32-tamp", "syscon", "simple-mfd";
reg = <0x5c00a000 0x400>;
};
--
2.28.0
next prev parent reply other threads:[~2020-10-21 10:35 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-21 10:28 [PATCH v2 1/2] dt-bindings: arm: stm32: add simple-mfd compatible for tamp node Ahmad Fatoum
2020-10-21 10:28 ` Ahmad Fatoum [this message]
2020-11-17 11:18 ` [PATCH v2 2/2] ARM: dts: stm32: support child mfd cells for the stm32mp1 TAMP syscon Alexandre Torgue
2020-10-26 14:36 ` [PATCH v2 1/2] dt-bindings: arm: stm32: add simple-mfd compatible for tamp node Rob Herring
2020-10-26 21:30 ` Ahmad Fatoum
2020-10-27 12:15 ` Rob Herring
2020-11-10 10:27 ` Ahmad Fatoum
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